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The General Subject. 
Anatomy and Physiology. 
The chief object of Boll^s histological researches, made during 
a stay of two months at Nice, under the eyes of Prof. Max 
Schultze, into Cephalopods, Heteropods, Chiton, and some 
Opisthobranchs, and supplemented by observations on land 
mollusks, has been to determine how far the elementary struc- 
ture of mollnsks is really identical (homoloarous) with that of 
